The invention provides a solid-liquid rocket engine structure parameterization design method and a solid-liquid rocket engine structure parameterization design device. The method comprises the following steps: obtaining a task target, and determining a design scheme according to the task target; determining a design variable and a system parameter according to the design scheme; according to the design scheme, the design variable and the system parameter, deducing the relationship between the design variable and the system parameter and the solid-liquid rocket engine mass and the solid-liquidrocket engine size; and obtaining the numerical value of the design variable, and calculating the structure parameterization result of the solid-liquid rocket engine according to the relationship between the design variable and the solid-liquid rocket engine mass and the solid-liquid rocket engine size. By means of the design, the structural design of the solid-liquid rocket engine is streamlined,and a visual design method is provided for designers; the steps of structural design of the solid-liquid rocket engine are optimized, the calculated amount is reduced, and the design efficiency of designers is improved. The whole design process is parameterized and modeled, so that the calculation time is reduced, and a calculation program is provided for repeated design under different conditions.